替诺福韦酯对阿德福韦酯应答不佳患者的挽救治疗研究进展

阿德福韦酯(adefovir dipivoxil,ADV)作为常用抗HBV治疗药物,与拉米夫定(lamivudine,LAM)、替比夫定和恩替卡韦无交叉耐药,且价格相对低廉,长期以来用于初治患者和LAM耐药患者的挽救治疗。然而由于ADV耐药基因屏障较低且临床用药剂量较低,临床长期应用累积了较多ADV应答不佳患者。替诺福韦酯(tenofovir disoproxil fumarate,TDF)作为ADV应答不佳患者的挽救治疗方案之一,对ADV初治应答不佳患者和LAM耐药的ADV应答不佳患者的临床疗效略有差异。然而多项体外研究显示TDF对ADV耐药病毒株抑制作用减弱。ADV应答不佳的患者换用TDF是否会引起或加重肾损害值得临床关注。本文就TDF对ADV应答不佳患者挽救治疗的国内外研究进展作综述,为提高耐药HBV感染防治的管理提供帮助。     

No detectable resistance to tenofovir disoproxil fumarate in HBeAg+ and HBeAg− patients with chronic hepatitis B after 8 years of treatment

A major hurdle in the long‐term treatment of chronic hepatitis B (CHB) patients is to maintain viral suppression in the absence of drug resistance. To date, no evidence of resistance to tenofovir disoproxil fumarate (TDF) has been observed. A cumulative evaluation of CHB patients who qualified for resistance surveillance over 8 years of TDF treatment was conducted. Patients in studies GS‐US‐174‐0102 (HBeAg?) and GS‐US‐174‐0103 (HBeAg+) were randomized 2:1 to receive TDF or adefovir dipivoxil (ADV) for 48 weeks followed by open‐label TDF through year 8. Population sequencing of HBV pol/RT was attempted for all TDF‐treated patients at baseline and, annually if viremic, at discontinuation, or with addition of emtricitabine. Overall, 88/641 (13.7%) patients qualified for sequence analysis at one or more time points. The percentage of patients qualifying for sequence analysis declined over time, from 9 to 11% in years 1‐2 to <4% over years 3‐8. Forty‐one episodes of virologic breakthrough (VB) occurred throughout the study, with most (n=29, 70%) associated with nonadherence to study medication. Fifty‐nine per cent of VB patients with an opportunity to resuppress HBV achieved HBV DNA resuppression. A minority of patients who qualified for sequencing had polymorphic (41/165, 24.8%) or conserved (17/165, 10.3%) site changes in pol/RT, with six patients developing lamivudine and/or ADV resistance‐associated mutations. No accumulation of conserved site changes was detected. The long‐term treatment of CHB with TDF monotherapy maintains effective suppression of HBV DNA through 8 years, with no evidence of TDF resistance or accumulation of conserved site changes.     

替诺福韦酯治疗慢性乙型肝炎的最新进展

在众多核苷和核苷酸类药物（NAs）中,替诺福韦（TDF）以其强效、低耐药性及对多种 NAs治疗失败的慢性乙型肝炎（CHB）患者有效的特点脱颖而出,使其在临床HBV感染治疗中被广泛应用。介绍了TDF对CHB初治患者和经治患者的疗效,并分析了其对肝硬化患者治疗的效果,同时也对TDF治疗的安全性进行了评估。认为TDF耐药率低、安全性好,为目前CHB治疗的一线药物。     

个性化疼痛护理在缓解妇科腹腔镜术后非切口性疼痛中的疗效观察

[目的]探讨个性化疼痛护理对妇科腹腔镜术(LS)后非切口性疼痛中的缓解作用。[方法]选择我院接受妇科LS术的病人96例,随机分成观察组和对照组各48例,观察组病人在手术期间给予个性化的疼痛护理,对照组仅给予常规护理。护理前后利用数字评分法(VAS)疼痛评分对两组病人的疼痛情况进行评价,并进行护理满意度调查。[结果]观察组病人非切口性疼痛发生率、重度疼痛率和疼痛持续时间分别为41.7%、4.2%和4.4h±3.9h,对照组分别为72.9%、25.0%和16.2h±5.8h,两组比较差异有统计学意义(P<0.05);两组病人术前VAS评分相比,差异无统计学意义(P>0.05),观察组术后12h和术后24hVAS评分明显低于对照组,差异有统计学意义(P<0.05);观察组护理满意度为91.7%,对照组护理满意度为68.8%,两组差异均有统计学意义(P<0.05)。[结论]个性化疼痛护理对妇科LS术后非切口性疼痛具有显著的缓解作用,可提高病人对护理服务的满意度。     

替诺福韦酯治疗慢性乙型肝炎的最新进展

核苷(酸)类似物抗病毒药物已广泛应用于慢性乙型肝炎的治疗,其中替诺福韦酯作为一种新型药物,以其良好的抗病毒作用及低耐药性成为目前研究的热点.本文概述了近年来替诺福韦酯的体内外研究进展及其在临床应用的前景.     

Long‐term entecavir or tenofovir disoproxil fumarate therapy in treatment‐naïve chronic hepatitis B patients in the real‐world setting

The aim of this study was to determine the long‐term efficacy of entecavir (ETV) and tenofovir disoproxil fumarate (TDF) on the natural course of disease in chronic hepatitis B patients (CHB) with/without cirrhosis in clinical practice. A total of 355 treatment‐naïve CHB patients were enrolled into the study. The primary outcome measure was viral suppression as defined by serum HBV DNA level <20 IU/mL. A secondary outcome measure was to determine the development of Hepatocellular carcinoma (HCC). Virological and biochemical responses were similar between the two treatment groups over time. The presence of cirrhosis and hepatitis B e antigen (HBeAg) positivity did not appear to impact viral suppression. The cumulative probability of HBeAg loss was 41% at 4 years of therapy. Hepatitis B surface antigen (HBsAg) loss occurred in four patients. Model for End‐Stage Liver Disease score was significantly improved from baseline to week 48 and 96 under antiviral therapy (P = 0.013, P = 0.01). HCC was diagnosed in 17 patients (4.8%). The cumulative probability of the development of HCC was 3.3% at 1 year and 7.3% at 4 years of therapy. The development of HCC was independently associated with older age (P = 0.031) and the presence of cirrhosis (P = 0.004). Serum creatinine levels and creatinine clearance remained stable over time. ETV and TDF effectively maintained virological and biochemical responses in long‐term follow‐up of CHB patients with/without cirrhosis. HCC may still develop, although at a lower rate, and is more likely to develop in patients with cirrhosis, especially in older patients.     

Maintained virological suppression and renal function with reduced dose tenofovir disoproxil fumarate in renally impaired chronic hepatitis B patients

Tenofovir disoproxil fumarate (TDF) effectively suppresses viral replication in chronic hepatitis B (CHB), but occasionally leads to renal impairment. We evaluated the prevalence of viral and biochemical breakthrough and renal function kinetics in renally impaired patients with CHB on reduced and on full‐dose TDF. This clinic‐based longitudinal cohort study included patients receiving full and reduced dose TDF (due to eGFR [Cockcroft‐Gault] <60 mL/min/1.73 m²). Viral and biochemical breakthroughs were assessed 1 month after starting full and reduced TDF dose until the end‐of‐follow‐up. Breakthroughs were studied in full and reduced dose TDF, and renal function (MDRD) longitudinally before and after dose reduction within patients starting on full‐dose TDF. Of 750 patients on TDF, 78 (10%) had reduced dose and 672 (90%) full dose. At the time of dose reduction, 36 (46%) patients had chronic kidney disease stage G3B. A viral breakthrough occurred in one cirrhotic dialysis‐dependent patient (dosed 300 mg weekly) which resolved without signs of decompensation, and in one patient on full dose which resolved spontaneously. One biochemical breakthrough occurred during dose reduction and resolved naturally without viral breakthrough. The MDRD improved within the first year of dose reduction (+3.0 [2.5] mL/min per year; P < .005) and remained stable thereafter. Fifty‐three (79%) patients reached an MDRD >50 mL/min during dose reduction. Low dose TDF maintains renal function and viral suppression in most renally impaired patients with CHB, even in those with advanced liver disease. This useful, yet simple strategy could be particularly viable in resource‐constrained settings.     

Tenofovir plus lamivudine as rescue therapy for adefovir‐resistant chronic hepatitis B in hepatitis B e antigen‐positive patients with liver cirrhosis

Background/Aims: There is no consensus on the management of patients with adefovir (ADV)‐resistant hepatitis B virus (HBV) infection. The aim of this study was to investigate whether tenofovir disoproxil fumarate (TDF) combined with lamivudine (LMV) is effective and safe in patients with resistance to or non‐response to ADV. Methods: Six patients with HBV‐related cirrhosis, viral breakthrough during LMV therapy and viral breakthrough or non‐response during ADV therapy were treated daily with TDF plus LMV for at least 6 months. The HBV DNA level, alanine aminotransferase (ALT), the Child–Pugh score and serum creatinine were monitored. Genotypic LMV‐ or ADV‐resistant mutations were measured in stored samples. Results: In five of six patients, ADV‐resistant mutations at rt181 or rt236 were detected during ADV therapy. At 6 months of starting TDF/LMV combination, HBV DNA levels became undetectable (detection limit, 400 copies/ml) in four of six patients. Within 12 months, HBV DNA levels became undetectable in all patients, and ALT levels were normalized in four of six patients. These responses persisted up to the end of the observation period (median duration 16.5 months, range 6–21 months). The Child–Pugh scores improved in two of three patients with hepatic decompensation. No significant changes in serum creatinine were observed. Conclusion: Our data demonstrated that TDF plus LMV safely and markedly suppressed HBV replication in patients with resistance to or non‐response to ADV. This study suggests that this combination may be a promising rescue therapy for these patients, particularly those with liver cirrhosis or pre‐existing LMV resistance.     

Clinical course of 161 untreated and tenofovir‐treated chronic hepatitis B pregnant patients in a low hepatitis B virus endemic region

Hepatitis B immunoprophylaxis failure is linked to high maternal viraemia. There is limited North American data on hepatitis B outcomes in pregnancy. Pregnant hepatitis B carriers were enrolled January 2011–December 2014 and offered tenofovir in the 3rd trimester if hepatitis B virus (HBV)‐DNA was >7‐log IU/mL. Outcomes were determined in treated vs untreated patients. In total, 161 women with 169 pregnancies (one twin, 170 infants; median age 32 years), 18% (29/161) HBeAg+ and median HBV‐DNA 2.51 log IU/mL (IQR 1.66–3.65; range 0.8–8.1) were studied. 14.3% (23/161) received tenofovir due to high viral load (16/23, median 74 days, IQR 59–110) or due to liver disease (7/23). In 10/16 treated due to high viraemia, with confirmed adherence, follow‐up HBV‐DNA showed a 5.49 log decline (P = 0.003). In treatment naïve mothers, median alanine aminotransferase (ALT) increased from 17 IU/L (IQR 12–24) to 29 (IQR 18–36) post‐partum (P = 1.5e‐7). In seven highly viraemic mothers who declined therapy (HBV‐DNA >8‐log IU/mL); median ALT increased ~3X from baseline (P < 0.01). 26% (44/169) had Caesarean section with no difference in treated vs untreated subjects. No tenofovir‐treated mothers had renal dysfunction. Data were available on 167/170 infants; in 50.8% (85/167) who completed immunoprophylaxis, 98.8% (84/85, including 12 exposed to tenofovir in utero) were HBV immune. One infant born to an HBeAg+ mother with HBV‐DNA >8‐log IU/mL failed immunoprophylaxis. In this prospective Canadian cohort study, most untreated mothers experienced mild HBV flares. Tenofovir in pregnancy is well tolerated and reduces viral load prior to parturition.     

替诺福韦酯治疗34例慢性乙型肝炎核苷(酸)类似物经治患者的临床分析

目的观察替诺福韦酯(TDF)对慢性乙型肝炎(CHB)核苷(酸)类似物经治患者的临床疗效。方法回顾性分析TDF治疗34例CHB核苷(酸)类似物经治患者48周的临床资料,其中原发治疗失败患者18例、抗病毒耐药患者16例。分析第12、24、48周时HBV DNA阴转率、ALT复常率和48周的HBeAg血清转换率以及不良事件发生率。两组间比较采用t检验,多组间比较采用单因素方差分析。结果第12、24、48周的HBV DNA阴转率分别为35.3%、67.6%和94.1%。治疗前及治疗第12、24、48周的ALT分别为(63.9±18.9)、(49.8±11.9)、(42.7±7.3)和(35.1±3.9)U/L,治疗前后比较,差异有统计学意义(F=36.3,P0.05),48周时ALT复常率为91.1%。第48周时HBeAg阴转率为25%,HBeAg血清转换率为20%。治疗期间,随访各时间点病毒学突破率为0,肌酸激酶(CK)超过正常上限(ULN)2倍发生率0。血肌酐(Scr)治疗前为(75.1±11.1)μmol/L,治疗48周时为(76.8±10.8)μmol/L,差异无统计学意义(t=0.578,P=0.565)。Scr超过ULN发生率0。骨密度变化发生率0,血磷低于ULN发生率0。结论对于核苷(酸)类药物应答不佳和耐药的CHB患者,TDF单药治疗能有效抑制病毒,且ALT复常率高,不良事件发生率低。     

Improvement of bone mineral density and markers of proximal renal tubular function in chronic hepatitis B patients switched from tenofovir disoproxil fumarate to tenofovir alafenamide

Tenofovir alafenamide (TAF) is a novel prodrug that reduces tenofovir plasma levels by 90% compared to tenofovir disoproxil fumarate (TDF), resulting in decreased bone mineral density (BMD) loss and renal toxicity. We aimed to study changes in BMD and markers of renal function of chronic hepatitis B (CHB) patients previously treated with TDF who were switched to TAF in as early as 12 weeks. This was a prospective single‐arm open‐label study of 75 CHB patients treated with TDF 300 mg daily who were switched to TAF 25 mg daily and followed for 24 weeks. All patients had been treated with TDF for at least 12 months and had HBV DNA <21 IU/mL at the time of switch. BMD and markers of renal function were taken on the day of switch and repeated after 12 and 24 weeks of TAF treatment. Hip and spine bone mineral density significantly increased from baseline to week 12 (+12.9% and +2.4%, respectively, P < 0.01). There were significant decreases in urinary beta‐2‐microglobulin to creatinine and retinol‐binding protein to creatinine ratios by week 12 (P < 0.01 for both). Mean estimated glomerular filtration rate (GFR) did not change. Tubular reabsorption of phosphate was decreased at week 24 (P < 0.05). In conclusion, CHB patients previously treated with TDF experienced significant improvement in bone density and some markers of renal tubular function and as early as 12 weeks after switching to TAF. Bone density changes associated with TDF may not be entirely related to renal handling of phosphate.     

Validation of risk prediction scores for hepatocellular carcinoma in patients with chronic hepatitis B treated with entecavir or tenofovir

Several prediction scores for the early detection of hepatocellular carcinoma (HCC) are available. We validated the predictive accuracy of age, albumin, sex, liver cirrhosis (AASL), RESCUE‐B, PAGE‐B and modified PAGE‐B (mPAGE‐B) scores in chronic hepatitis B (CHB) patients treated with entecavir (ETV) or tenofovir disoproxil fumarate (TDF). Between 2007 and 2014, 3171 patients were recruited (1645, ETV; 1517, TDF). The predictive accuracy of each prediction score was assessed. The mean age of the study population (1977 men; 1194 women) was 48.8 years. Liver cirrhosis was present in 1040 (32.8%) patients. During follow‐up (median, 58.2 months), 280 (8.8%) patients developed HCC; these patients were significantly older; more likely to be male; had significantly higher proportions of liver cirrhosis, hypertension and diabetes; and had significantly higher values for the four risk scores than those who did not develop HCC (all P < .05). Older age (hazard ratio [HR] = 1.048), male sex (HR = 2.142), liver cirrhosis (HR = 3.144) and prolonged prothrombin time (HR = 2.589) were independently associated with an increased risk of HCC (all P < .05), whereas a higher platelet count (HR = 0.996) was independently associated with a decreased risk of HCC (P < .05). The predictive accuracy of AASL score was the highest for 3‐ and 5‐year HCC predictions (areas under the curve [AUCs] = 0.818 and 0.816, respectively), followed by RESCUE‐B, PAGE‐B and mPAGE‐B scores (AUC = 0.780‐0.815 and 0.769‐0.814, respectively). In conclusion, four HCC prediction scores were assessed in Korean CHB patients treated with ETV or TDF. The AASL score showed the highest predictive accuracy.